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rpm: How to list packages installed/upgraded today

If you’re using rpm-based Linux distro you may find this tip useful: if you want to list all packages installed or upgraded today (and by “today” I mean the current “today”, i.e. not hardcoded 2013/12/14, but the present time), just copy & paste the following snippet to the console window (this is ONE line!):
rpm -qa --qf '%{NAME} %{INSTALLTIME}\n' | perl -nale '($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime($F[1]);($Nsec,$Nmin,$Nhour,$Nmday,$Nmon,$Nyear,$Nwday,$Nyday,$Nisdst)=localtime(time);print $F[0] if ($year==$Nyear && $mon==$Nmon && $mday==$Nmday)'

Here is how it works: we list all packages in a format “packagename installtime”. “installtime” is in a common Unix/Linux format: it is a number of seconds after a date called “epoch”. To convert it to something more readable/useful we can use perl and its function localtime, which converts it to an array of numbers of various meaning (like elements of the date: year, month, day, etc.). localtime(time) returns, on the other hand, the same data, but for the present time. So we just compare these two sets of values and if they match – we print the package name. Easy, isn’t it? 😉